9. Zimmer, Lori. Digital image. Spanish City Offers Lifetime Tram Passes in Exchange for Cars Read More: Spanish City Offers Lifetime Tram Passes in Exchange for Cars | Inhabitat - Sustainable Design Innovation, Eco Architecture, Green Building. 12 July 2011. Web. 17 Apr. 2012. <http://inhabitat.com/spanish-city-offers-lifetime-tram-passes-in-exchange-for-cars/>.
Colorful truck. Digital image. Lew's Other Pics. Blogger, 7 Aug. 2011. Web. 29 Mar. 2012. <http://lewsotherpics.blogspot.com/2010/08/photohunt-colorful-truck.html>.
Original Petroliana. Digital image. Oldsign. Web. 30 Mar. 2012. <http://www.oldsign.com>.
1972 Service Station Gas Pump Pictures? Digital image. The Online Resource for 1947- Current Chevy and GMC Trucks since 1997. Web. 30 Mar. 2012. <http://67-72chevytrucks.com/vboard/showthread.php?t=434795>.
Gas Stations. Digital image. Ohio.gov. Web. 30 Mar. 2012. <http://www.epa.ohio.gov/ocapp/business_sector.aspx>.
Oil Refinery Pump. Digital image. Al Ghurair To Set Up Oil Refinery In Sindh. Web. 2 Apr. 2012. <http://pkeconomists.com/wp-content/uploads/2011/12/Oil-Refinery-Pump-Image1.jpg>.
Solution Pics-
1. Staff, Eboom. Pipeline. Digital image. PRESIDENT OBAMA DENIES KEYSTONE XL PIPELINE. 18 Jan. 2012. Web. 10 Apr. 2012. <http://www.energyboom.com/yes/president-obama-denies-keystone-xl-pipeline>.
2. Samuelson, Tracey D. Off shore oil plant. Digital image. Obama's New Offshore Drilling Plan Won't Cut Gas Prices. 31 Mar. 2010. Web. 10 Apr. 2012. <http://www.csmonitor.com/Business/new-economy/2010/0331/Obama-s-new-offshore-drilling-plan-won-t-cut-gas-prices>.
3. TransCanada. Digital image. TransCanada Pipelines Ltd. Web. 12 Apr. 2012. <http://fr.equitek.ca/carrieres/offres-emploi-actuelles/transcanada-pipelines-ltd/>.
4. Crude Oil Offshore Drilling. Digital image. Science Facts. Web. 16 Apr. 2012. <http://www.sciencefacts.us/crude-oil-offshore-drilling/>.
5.Signs of Our Times. Digital image. Prices. Web. 17 Apr. 2012. <http://www.picable.com/slicedshow/tags/prices>.
6. Avro, Samuel R. Digital image. Dept. of Energy Cuts Crude Oil Demand Forecast. 9 Dec. 2008. Web. 17 Apr. 2012. <http://www.consumerenergyreport.com/2008/12/09/dept-of-energy-cuts-crude-oil-demand-forecast/>.
7. DC, Washington. Digital image. Lawmakers Continue to Move Keystone Pipeline Project Forward. 25 Jan. 2012. Web. 17 Apr. 2012. <http://www.c-span.org/Events/Lawmakers-Continue-to-Move-Keystone-Pipeline-Project-Forward/10737427430/>.
8. Digital image. London Police Close Gas Stations after "panic-buying" 29 Mar. 2012. Web. 17 Apr. 2012. <http://www.wbrz.com/news/london-police-close-gas-stations-after-panic-buying->.
9. Zimmer, Lori. Digital image. Spanish City Offers Lifetime Tram Passes in Exchange for Cars Read More: Spanish City Offers Lifetime Tram Passes in Exchange for Cars | Inhabitat - Sustainable Design Innovation, Eco Architecture, Green Building. 12 July 2011. Web. 17 Apr. 2012. <http://inhabitat.com/spanish-city-offers-lifetime-tram-passes-in-exchange-for-cars/>.
10. Rutter's Logo. Digital image. Archives for February 2010. Web. 17 Apr. 2012. <http://www.rutters.com/?m=201002>.
11. Oil shale. Digital image. What Is Oil Shale? 2 Dec. 2011. Web. 17 Apr. 2012. <http://www.whatisall.com/environment-and-animals/what-is-oil-shale.html>.
12. Exclusive Shell Lubricant Jobber. Digital image. Welcome to Shuster Oil Co., Inc. Web. 17 Apr. 2012. <http://www.shusteroil.com/>.
13. www.manicore.com. What Are the Gases That Generate the Higher Greenhouse Effects and Where Do They Come from ? Digital image. What Are the Greenhouse Gases ? Web. 17 Apr. 2012. <http://www.manicore.com/anglais/documentation_a/greenhouse/greenhouse_gas.html>.
14. BP Oil Spill. Digital image. BP Settlement. Web. 17 Apr. 2012. <http://www.bpoildamageclaims.com/>.
15. Why do gasoline prices differ across U.S. states? Digital image. Econbrowser. 21 Mar. 2012. Web. 19 Apr. 2012. <http://www.econbrowser.com/archives/2012/03/why_do_gasoline.html>.
16. Hybrid car. Digital image. Hybrids Peak Sales in Japan. 19 Apr. 2012. Web. 19 Apr. 2012. <http://www.bgdna.com/vehicles/hybrids-peak-sales-in-japan.html>.